import { useEffect, useState } from "react";
import Sidebar from "@/components/SettingsSidebar";
import { isMobile } from "react-device-detect";
import showToast from "@/utils/toast";
import System from "@/models/system";
import paths from "@/utils/paths";
import { AUTH_TIMESTAMP, AUTH_TOKEN, AUTH_USER } from "@/utils/constants";
import PreLoader from "@/components/Preloader";

export default function GeneralSecurity() {
  return (
    <div className="w-screen h-screen overflow-hidden bg-sidebar flex">
      <Sidebar />
      <div
        style={{ height: isMobile ? "100%" : "calc(100% - 32px)" }}
        className="transition-all duration-500 relative md:ml-[2px] md:mr-[16px] md:my-[16px] md:rounded-[16px] bg-main-gradient w-full h-full overflow-y-scroll border-2 border-outline"
      >
        <MultiUserMode />
        <PasswordProtection />
      </div>
    </div>
  );
}

function MultiUserMode() {
  const [saving, setSaving] = useState(false);
  const [hasChanges, setHasChanges] = useState(false);
  const [useMultiUserMode, setUseMultiUserMode] = useState(false);
  const [multiUserModeEnabled, setMultiUserModeEnabled] = useState(false);
  const [loading, setLoading] = useState(true);

  const handleSubmit = async (e) => {
    e.preventDefault();
    setSaving(true);

    if (useMultiUserMode) {
      const form = new FormData(e.target);
      const data = {
        username: form.get("username"),
        password: form.get("password"),
      };

      const { success, error } = await System.setupMultiUser(data);
      if (success) {
        showToast("Multi-User mode enabled successfully.", "success");
        setSaving(false);
        setTimeout(() => {
          window.localStorage.removeItem(AUTH_USER);
          window.localStorage.removeItem(AUTH_TOKEN);
          window.localStorage.removeItem(AUTH_TIMESTAMP);
          window.location = paths.settings.users();
        }, 2_000);
        return;
      }

      showToast(`Failed to enable Multi-User mode: ${error}`, "error");
      setSaving(false);
      return;
    }
  };

  useEffect(() => {
    async function fetchIsMultiUserMode() {
      setLoading(true);
      const multiUserModeEnabled = await System.isMultiUserMode();
      setMultiUserModeEnabled(multiUserModeEnabled);
      setLoading(false);
    }
    fetchIsMultiUserMode();
  }, []);

  if (loading) {
    return (
      <div className="h-1/2 transition-all duration-500 relative md:ml-[2px] md:mr-[8px] md:my-[16px] md:rounded-[26px] p-[18px] h-full overflow-y-scroll">
        <div className="w-full h-full flex justify-center items-center">
          <PreLoader />
        </div>
      </div>
    );
  }

  return (
    <form
      onSubmit={handleSubmit}
      onChange={() => setHasChanges(true)}
      className="flex w-full"
    >
      <div className="flex flex-col w-full px-1 md:px-20 md:py-12 py-16">
        <div className="w-full flex flex-col gap-y-1 pb-6 border-white border-b-2 border-opacity-10">
          <div className="items-center flex gap-x-4">
            <p className="text-2xl font-semibold text-white">Multi-User Mode</p>
            {hasChanges && (
              <button
                type="submit"
                disabled={saving}
                className="border border-slate-200 px-4 py-1 rounded-lg text-slate-200 text-sm items-center flex gap-x-2 hover:bg-slate-200 hover:text-slate-800"
              >
                {saving ? "Saving..." : "Save changes"}
              </button>
            )}
          </div>
          <p className="text-sm font-base text-white text-opacity-60">
            Set up your instance to support your team by activating Multi-User
            Mode.
          </p>
        </div>
        <div className="relative w-full max-h-full">
          <div className="relative rounded-lg">
            <div className="flex items-start justify-between px-6 py-4"></div>
            <div className="space-y-6 flex h-full w-full">
              <div className="w-full flex flex-col gap-y-4">
                <div className="">
                  <label className="mb-2.5 block font-medium text-white">
                    {multiUserModeEnabled
                      ? "Multi-User Mode is Enabled"
                      : "Enable Multi-User Mode"}
                  </label>

                  <label className="relative inline-flex cursor-pointer items-center">
                    <input
                      type="checkbox"
                      onClick={() => setUseMultiUserMode(!useMultiUserMode)}
                      checked={useMultiUserMode}
                      className="peer sr-only pointer-events-none"
                    />
                    <div
                      hidden={multiUserModeEnabled}
                      className="pointer-events-none peer h-6 w-11 rounded-full bg-stone-400 after:absolute after:left-[2px] after:top-[2px] after:h-5 after:w-5 after:rounded-full after:shadow-xl after:border after:border-gray-600 after:bg-white after:box-shadow-md after:transition-all after:content-[''] peer-checked:bg-lime-300 peer-checked:after:translate-x-full peer-checked:after:border-white peer-focus:outline-none peer-focus:ring-4 peer-focus:ring-blue-800"
                    ></div>
                  </label>
                </div>
                {useMultiUserMode && (
                  <div className="w-full flex flex-col gap-y-2 my-5">
                    <div className="w-80">
                      <label
                        htmlFor="username"
                        className="block mb-3 font-medium text-white"
                      >
                        Admin account username
                      </label>
                      <input
                        name="username"
                        type="text"
                        className="bg-zinc-900 text-white text-sm rounded-lg focus:border-blue-500 block w-full p-2.5 placeholder:text-white/20 focus:ring-blue-500"
                        placeholder="Your admin username"
                        minLength={2}
                        required={true}
                        autoComplete="off"
                        disabled={multiUserModeEnabled}
                        defaultValue={multiUserModeEnabled ? "********" : ""}
                      />
                    </div>
                    <div className="mt-4 w-80">
                      <label
                        htmlFor="password"
                        className="block mb-3 font-medium text-white"
                      >
                        Admin account password
                      </label>
                      <input
                        name="password"
                        type="text"
                        className="bg-zinc-900 text-white text-sm rounded-lg focus:border-blue-500 block w-full p-2.5 placeholder:text-white/20 focus:ring-blue-500"
                        placeholder="Your admin password"
                        minLength={8}
                        required={true}
                        autoComplete="off"
                        defaultValue={multiUserModeEnabled ? "********" : ""}
                      />
                    </div>
                  </div>
                )}
              </div>
            </div>
            <div className="flex items-center justify-between space-x-14">
              <p className="text-white/80 text-xs rounded-lg w-96">
                By default, you will be the only admin. As an admin you will
                need to create accounts for all new users or admins. Do not lose
                your password as only an Admin user can reset passwords.
              </p>
            </div>
          </div>
        </div>
      </div>
    </form>
  );
}

function PasswordProtection() {
  const [saving, setSaving] = useState(false);
  const [hasChanges, setHasChanges] = useState(false);
  const [multiUserModeEnabled, setMultiUserModeEnabled] = useState(false);
  const [usePassword, setUsePassword] = useState(false);
  const [loading, setLoading] = useState(true);

  const handleSubmit = async (e) => {
    e.preventDefault();
    if (multiUserModeEnabled) return false;

    setSaving(true);
    const form = new FormData(e.target);
    const data = {
      usePassword,
      newPassword: form.get("password"),
    };

    const { success, error } = await System.updateSystemPassword(data);
    if (success) {
      showToast("Your page will refresh in a few seconds.", "success");
      setSaving(false);
      setTimeout(() => {
        window.localStorage.removeItem(AUTH_USER);
        window.localStorage.removeItem(AUTH_TOKEN);
        window.localStorage.removeItem(AUTH_TIMESTAMP);
        window.location.reload();
      }, 3_000);
      return;
    } else {
      showToast(`Failed to update password: ${error}`, "error");
      setSaving(false);
    }
  };

  useEffect(() => {
    async function fetchIsMultiUserMode() {
      setLoading(true);
      const multiUserModeEnabled = await System.isMultiUserMode();
      const settings = await System.keys();
      setMultiUserModeEnabled(multiUserModeEnabled);
      setUsePassword(settings?.RequiresAuth);
      setLoading(false);
    }
    fetchIsMultiUserMode();
  }, []);

  if (loading) {
    return (
      <div className="h-1/2 transition-all duration-500 relative md:ml-[2px] md:mr-[8px] md:my-[16px] md:rounded-[26px] p-[18px] h-full overflow-y-scroll">
        <div className="w-full h-full flex justify-center items-center">
          <PreLoader />
        </div>
      </div>
    );
  }

  if (multiUserModeEnabled) return null;
  return (
    <form
      onSubmit={handleSubmit}
      onChange={() => setHasChanges(true)}
      className="flex w-full"
    >
      <div className="flex flex-col w-full px-1 md:px-20 md:py-12 py-16">
        <div className="w-full flex flex-col gap-y-1 pb-6 border-white border-b-2 border-opacity-10">
          <div className="items-center flex gap-x-4">
            <p className="text-2xl font-semibold text-white">
              Password Protection
            </p>
            {hasChanges && (
              <button
                type="submit"
                disabled={saving}
                className="border border-slate-200 px-4 py-1 rounded-lg text-slate-200 text-sm items-center flex gap-x-2 hover:bg-slate-200 hover:text-slate-800"
              >
                {saving ? "Saving..." : "Save changes"}
              </button>
            )}
          </div>
          <p className="text-sm font-base text-white text-opacity-60">
            Protect your AnythingLLM instance with a password. If you forget
            this there is no recovery method so ensure you save this password.
          </p>
        </div>
        <div className="relative w-full max-h-full">
          <div className="relative rounded-lg">
            <div className="flex items-start justify-between px-6 py-4"></div>
            <div className="space-y-6 flex h-full w-full">
              <div className="w-full flex flex-col gap-y-4">
                <div className="">
                  <label className="mb-2.5 block font-medium text-white">
                    Password Protect Instance
                  </label>

                  <label className="relative inline-flex cursor-pointer items-center">
                    <input
                      type="checkbox"
                      onClick={() => setUsePassword(!usePassword)}
                      checked={usePassword}
                      className="peer sr-only pointer-events-none"
                    />
                    <div className="pointer-events-none peer h-6 w-11 rounded-full bg-stone-400 after:absolute after:left-[2px] after:top-[2px] after:h-5 after:w-5 after:rounded-full after:shadow-xl after:border after:border-gray-600 after:bg-white after:box-shadow-md after:transition-all after:content-[''] peer-checked:bg-lime-300 peer-checked:after:translate-x-full peer-checked:after:border-white peer-focus:outline-none peer-focus:ring-4 peer-focus:ring-blue-800"></div>
                  </label>
                </div>
                {usePassword && (
                  <div className="w-full flex flex-col gap-y-2 my-5">
                    <div className="mt-4 w-80">
                      <label
                        htmlFor="password"
                        className="block mb-3 font-medium text-white"
                      >
                        Instance password
                      </label>
                      <input
                        name="password"
                        type="text"
                        className="bg-zinc-900 text-white text-sm rounded-lg focus:border-blue-500 block w-full p-2.5 placeholder:text-white/20 focus:ring-blue-500"
                        placeholder="Your Instance Password"
                        minLength={8}
                        required={true}
                        autoComplete="off"
                        defaultValue={usePassword ? "********" : ""}
                      />
                    </div>
                  </div>
                )}
              </div>
            </div>
            <div className="flex items-center justify-between space-x-14">
              <p className="text-white/80 text-xs rounded-lg w-96">
                By default, you will be the only admin. As an admin you will
                need to create accounts for all new users or admins. Do not lose
                your password as only an Admin user can reset passwords.
              </p>
            </div>
          </div>
        </div>
      </div>
    </form>
  );
}
